PIC16F15213 datasheet(104/408 Pages) MICROCHIP

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Figure 15-1. Program Flash Memory Read Sequence

Filename:

10-000046D.vsd

Title:

FLASH PROGRAM MEMORY READ FLOWCHART

Last Edit:

8/15/2016

First Used:

PIC16(L)F15354/55

Note:

Start

Read Operation

Select Memory:

rogram Memory, DIA, DCI,

Config Words, User ID (NVMREGS)

Select

Word Address

(NVMADRH:NVMADRL)

Data read now in

NVMDATH:NVMDATL

End

Read Operation

Rev. 10-000046

5/17/2017

Example 15-1. Program Memory read

* This code block will read 1 word of program

* memory at the memory address:

PROG_ADDR_HI : PROG_ADDR_LO

data will be returned in the variables:

PROG_DATA_HI, PROG_DATA_LO

BANKSEL

NVMADRL

; Select Bank for NVMCON registers

MOVLW

PROG_ADDR_LO

MOVWF

NVMADRL

; Store LSB of address

MOVLW

PROG_ADDR_HI

MOVWF

NVMADRH

; Store MSB of address

BCF

NVMCON1,NVMREGS

; Do not select Configuration Space

BSF

NVMCON1,RD

; Initiate read

MOVF

NVMDATL,W

; Get LSB of word

MOVWF

PROG_DATA_LO

; Store in user location

MOVF

NVMDATH,W

; Get MSB of word

MOVWF

PROG_DATA_HI

; Store in user location

15.3.2

NVM Unlock Sequence

The unlock sequence is a mechanism that protects the NVM from unintended self-write programming or erasing. The

sequence must be executed and completed without interruption to successfully complete any of the following

operations:

• PFM Row Erase

• Write of PFM write latches to PFM memory

• Write of PFM write latches to User IDs

• Write to Configuration Words

The unlock sequence consists of the following steps and must be completed in order:

PIC16F15225/45

NVM - Nonvolatile Memory Control

Preliminary Datasheet

DS20006389B-page 104

PIC16F15213 Datasheet(PDF) 104 Page - Microchip Technology

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